HTML5 Canvas Drag and Drop Events

To detect drag and drop events with Konva, we can use the on() method to
bind dragstart, dragmove, or dragend events to a node.
The on() method requires an event type and a function to be executed when the event occurs.

Konva Drag Events Demoview raw

<!DOCTYPE html>
<html>
  <head>
    <script src="https://unpkg.com/[email protected]/konva.min.js"></script>
    <meta charset="utf-8" />
    <title>Konva Drag Events Demo</title>
    <style>
      body {
        margin: 0;
        padding: 0;
        overflow: hidden;
        background-color: #f0f0f0;
      }
    </style>
  </head>
  <body>
    <div id="container"></div>
    <script>
      function writeMessage(message) {
        text.text(message);
      }
      var width = window.innerWidth;
      var height = window.innerHeight;

      var stage = new Konva.Stage({
        container: 'container',
        width: width,
        height: height,
      });

      var layer = new Konva.Layer();

      var text = new Konva.Text({
        x: 10,
        y: 10,
        fontFamily: 'Calibri',
        fontSize: 24,
        text: '',
        fill: 'black',
      });

      var box = new Konva.Rect({
        x: 20,
        y: 100,
        offset: [50, 25],
        width: 100,
        height: 50,
        fill: '#00D2FF',
        stroke: 'black',
        strokeWidth: 4,
        draggable: true,
      });

      // write out drag and drop events
      box.on('dragstart', function () {
        writeMessage('dragstart');
      });
      box.on('dragend', function () {
        writeMessage('dragend');
      });

      layer.add(text);
      layer.add(box);

      // add the layer to the stage
      stage.add(layer);
    </script>
  </body>
</html>

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